Did I just kill my fish?

  • We are currently upgrading MFK. thanks! -neo

ChiPerf

Candiru
MFK Member
55 gallon with a few average sized cichlids in there. Did a 1/3 water change and changed the external cartridge type carbon filters too, and now my tinfoil barb 4" is upside down breathing hard at the surface, and 3 other fish are at the top sucking air too. What did I do to them?
 
That usually comes from adding water that is cooler or warmer or not enough dechlorinator. At work when fish start doing that after water changes, amquel snaps them out of it.

I've also accidentally done full water changes on sick and sensitive fish. As long as I filled with the right temperature water and used dechlor though, I've never had any problems with that.
 
Only thing I have running in the tank is one of those stupid external cartridge type filters and a heater. That's it. I posted a thread a few days ago about proper filtration, and have a lot to learn. No idea what the difference between biological and chemical and mechanical filtration is, and what is the hot setup for each/all. I haven't had a chance to research too much, but I guess that just got moved to the front of the line now.
 
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